The lead-free nitrogen dual wave soldering machine series employs advanced nitrogen protection technology, combined with a Siemens PLC intelligent control system and a PID precision temperature control system, featuring real-time monitoring of oxygen concentration and easy adjustment. With a nitrogen consumption of approximately 25 m³/hr and an oxygen concentration of ≤800 ppm, this series effectively reduces tin dross generation, lowers costs, and minimizes oxide residue on the board surface. Paired with a dedicated chiller, it enhances cooling efficiency, improves soldering quality, and ensures production stability. It provides a highly reliable lead-free soldering solution for complex PCB soldering processes.